@article{pulido2018a,
  title = {A multi-level framework for metabolism in urban energy systems from an ecological perspective}
  author = {Pulido Barrera, Paola; Rosales Carreón, Jesús; de Boer, Hugo J.},
  journal = {Resources, Conservation and Recycling},
  url = {http://www.sciencedirect.com/science/article/pii/S0921344917301192},
  doi = {10.1016/j.resconrec.2017.05.005},
  year = {2018}
}